SR125 Coil advice?

[His Dudeness]

[quote author=BBROWN1664 link=topic=24692.msg286660#msg286660 date=1541609944]
why not just get the right one?
https://www.ebay.co.uk/p/Ignition-Coil-Y...1837091390

Just because I'd rather buy new rather than second hand.


@ His Dudeness, You are right about the constant and the switched. I definitely have full 12v feed, and the coil will generate a solid spark at first then dwindle away to nothing. I've hooked up the multimeter and check the resistance of the coil. rough figures (don't have it in front of me) were:


Haynes
orange to red - 2.75 ohm +-10%
orange to ht - 7.5k ohm +-10%


Mine
orange to red - 3.2 ohm
orange to ht - 13.4k ohm


which seems like coil has an issue, even if it's not the only issue.
[/quote]
That sounds like the coil probably got hot and was damaged. If the coil is damaged it'd be a good idea to replace the ht lead, spark plug cap and  spark plug at the same time as the coil because I think if you have high resistance in them it can be the reason why the coil over heated in the first place. You could check their resistances if you want but it'd only cost a few pounds to replace them so you might do the lot to protect your new coil.